code: def test_reg_cv_metrics(regression_explainer_with_cv):
      assert isinstance(regression_explainer_with_cv.metrics(), dict)
  
file_path: explainerdashboard/tests/test_cv.py
imports: import pytest
  import pandas
  from explainerdashboard.explainers import ClassifierExplainer, RegressionExplainer
  from explainerdashboard.datasets import titanic_survive, titanic_fare
label_desc: Use image node_id 6 for calling a global function with example usage: test_reg_cv_metrics(regression_explainer_with_cv) without return types